tonearm bearing adjustment/knife edge

i have a Sansui SR 525 turntable which has a tonearm with knife edgebearings. i have experience adjusting the bearings on arms which are not knife edge, but no experience with knife edge. firstly are knife edge bearings normally "sloppy" meaning allowing the arm tube/weight assemblyto be moved in the bearing support both fore and aft, and side to side?secondly, are knife edge bearings capable of being adjusted or are theyassembled as a module and only replaceable with a new module?any help will be much appreciated

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